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H. A. Leupold G. J. Iafrate F. Rothwarf J. T. Breslin D. Edmiston T. R. AuCoin 《Journal of Low Temperature Physics》1977,28(3-4):241-261
Anomalies previously reported in the specific heat curve of normal-state niobium at 3 and 9.5 K prompted new measurements on single crystals of niobium, tantalum, and vanadium from their superconductingT
c
's up to 20 K. The upper anomaly was confirmed in Nb and found to occur at 10.3 K. At this temperature theC/T vs. T
2
curve changed abruptly from a line with constants
2
=7.67 mJ/K
2
mole and
2
=241 K to one with
3
=9.16 mJ/K
2
mole and
3
=250 K. The NbT
c
was 9.275 K. Anomalies similar to that occurring at 3 K in the niobium curve were discovered to exist in tantalum and vanadium as well, but at the higher temperatures of 7.19 and 7.47 K, respectively. The tantalum data yielded line constants of
1
=5.42 mJ/K mole,
1
=238 K,
2
=4.36 mJ/K
2
mole, and
2
=228 K and aT
c
of 4.475 K. For vanadium
1
=397 K is higher than previous specific heat values of
1
=382 K, and in agreement with that obtained from elastic constant measurements (399 K). The discontinuities in the slopes of the specific heat curves are analyzed in terms of anomalies in the electron and phonon spectra of the materials investigated. 相似文献
24.
Droll Jason A.; Hayhoe Mary M.; Triesch Jochen; Sullivan Brian T. 《Canadian Metallurgical Quarterly》2005,31(6):1416
Attention and working memory limitations set strict limits on visual representations, yet researchers have little appreciation of how these limits constrain the acquisition of information in ongoing visually guided behavior. Subjects performed a brick sorting task in a virtual environment. A change was made to 1 of the features of the brick being held on about 10% of trials. Rates of change detection for feature changes were generally low and depended on the pick-up and put-down relevance of the feature to the sorting task. Subjects' sorting decision suggests that changes may be missed because of a failure to update the changed feature. The authors also explore how hand and eye behavior are coordinated for strategic acquisition and storage of visual information throughout the task. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
25.
Rainer Steegmüller Jochen Ulmer Michael Quellmalz Markus Wohlschlögel Andreas Schüßler 《Journal of Materials Engineering and Performance》2014,23(7):2450-2456
New ingot qualities, processed by optimized vacuum arc remelting (VAR), optimized vacuum induction melting followed by VAR and VAR followed by electron beam remelting, were compared with standard quality. Finished components as well as diamond-shaped samples representing a typical dimension of self-expanding stents were produced using Nitinol tubing drawn from the new ingot qualities. Metallographic longitudinal sections were prepared and analyzed to determine inclusion size and distributions of the various ingot qualities. Radial force and uniaxial tensile tests were used to determine the mechanical properties of fully processed material and tubing, respectively. Transformation temperatures of tubing as delivered from supplier and processed stents were measured by differential scanning calorimetry and deformation-and-free-recovery testing. Finally, fatigue tests were performed on diamond-shaped samples to evaluate the strain-life characteristics of the new ingot qualities. Results of this study are compared to ADMEDES historical data from standard Nitinol materials to gain an assessment of the new improved ingot qualities with regard to the production of Nitinol vascular implants. The latest developments in Nitinol ingot quality are highlighted and the results of the comparison from technical point of view are shown. 相似文献
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Klaus Kaiser Jochen Schütz Ruth Schöbel Sebastian Noelle 《Journal of scientific computing》2017,70(3):1390-1407
In this work, we propose a new way of splitting the flux function of the isentropic compressible Euler equations at low Mach number into stiff and non-stiff parts. Following the IMEX methodology, the latter ones are treated explicitly, while the first ones are treated implicitly. The splitting is based on the incompressible limit solution, which we call reference solution. An analysis concerning the asymptotic consistency and numerical results demonstrate the advantages of this splitting. 相似文献